# Common Core: High School - Geometry : AA Criterion using Similarity Transformations: CCSS.Math.Content.HSG-SRT.A.3

## Example Questions

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### Example Question #21 : Similarity, Right Triangles, & Trigonometry

Given the black, green, and purple triangles below, determine which of the triangles are similar?

The black and green triangle are similar.

All triangles are similar.

The purple and black triangle are similar.

None of the triangles are similar.

The green and purple triangle are similar.

The black and green triangle are similar.

Explanation:

To determine whether triangles are similar recall what "similar" means and the AA identity. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

Knowing this, look at the black triangle.

Two angles are given and the third can be calculated.

Now, look at the green triangle.

Now, look at the purple triangle.

Since the black and green triangle have the same angle measurements, they are considered to be similar. The purple triangle only has one angle that is congruent to the other triangles thus, the purple triangle is not similar to either of the other two triangles.

### Example Question #22 : Similarity, Right Triangles, & Trigonometry

Given the black, green, and purple triangles below, determine which of the triangles are similar?

The green and purple triangles are similar.

The black and purple triangles are similar.

None of the triangles are similar.

The black and green triangle are similar.

All triangles are similar

All triangles are similar

Explanation:

To determine whether triangles are similar recall what "similar" means and the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

Knowing this, look at the black triangle.

Two angles are given and the third can be calculated.

Now, look at the green triangle.

Now, look at the purple triangle.

Since the black and green triangle have the same angle measurements, they are considered to be similar. The purple triangle also has the same angle measurements as the black and green triangles thus, all three triangles are similar.

### Example Question #3 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

The  above has . Which of the following triangle measurements would be similar to .

Explanation:

To determine whether triangles are similar recall what "similar" means by the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

is given below. By the figure it is known that  and by the statement, . Knowing this information, the measure of the last angle can be calculated.

Therefore, for a triangle to be similar to  by the AA criterion, the triangle must have angle measurements of 26, 36, and 118 degrees. Thus,  is a similar triangle.

### Example Question #4 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

The  above has . Which of the following triangle measurements would be similar to .

Explanation:

To determine whether triangles are similar recall what "similar" means by the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

is given below. By the figure it is known that  and by the statement, . Knowing this information, the measure of the last angle can be calculated.

Therefore, for a triangle to be similar to  by the AA criterion, the triangle must have angle measurements of 26, 36, and 118 degrees. Thus,  is a similar triangle.

### Example Question #1 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

The  above has . Which of the following triangle measurements would be similar to .

Explanation:

To determine whether triangles are similar recall what "similar" means by the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

is given below. By the figure it is known that  and by the statement, . Knowing this information, the measure of the last angle can be calculated.

Therefore, for a triangle to be similar to  by the AA criterion, the triangle must have angle measurements of 17, 13, and 150 degrees. Thus,  is a similar triangle.

### Example Question #1 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

The  above has . Which of the following triangle measurements would be similar to .

Explanation:

To determine whether triangles are similar recall what "similar" means by the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

is given below. By the figure it is known that  and by the statement, . Knowing this information, the measure of the last angle can be calculated.

Therefore, for a triangle to be similar to  by the AA criterion, the triangle must have angle measurements of 17, 24, and 139 degrees. Thus,  is a similar triangle.

### Example Question #31 : Similarity, Right Triangles, & Trigonometry

Determine whether the statement is true or false.

In  , and in  the  and .   and  are similar by the AA criterion.

True

False

True

Explanation:

To determine whether triangles are similar recall what "similar" means and the AA identity. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

Looking at the given triangles and their characteristics, similarity can be identified.

In  , and in  the  and .

First calculate the measurement of angle C.

Therefore,  and  are similar by the AA criterion.

### Example Question #1 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

The  above has . Which of the following triangle measurements would be similar to .

Explanation:

To determine whether triangles are similar recall what "similar" means by the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

is given below. By the figure it is known that  and by the statement, . Knowing this information, the measure of the last angle can be calculated.

Therefore, for a triangle to be similar to  by the AA criterion, the triangle must have angle measurements of 42, 92, and 46 degrees. Thus,  is a similar triangle.

### Example Question #3 : Aa Criterion Using Similarity Transformations: Ccss.Math.Content.Hsg Srt.A.3

Determine which triangles are similar.

Triangles A and B are similar.

Triangles B and C are similar.

All triangles are similar.

None of the triangles are similar.

Triangles C and A are similar.

Triangles A and B are similar.

Explanation:

To determine whether triangles are similar recall what "similar" means and the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

Knowing this, look at triangle A.

Two angles are given and the third can be calculated.

Now, look at triangle B.

Now, look at triangle C.

Since triangles A and B have the same angle measurements, they are considered to be similar. Triangle C only has one angle that is congruent to the other triangles thus, triangle C is not similar to either of the other two triangles.

### Example Question #31 : Similarity, Right Triangles, & Trigonometry

Determine which of the triangles are similar.

Triangles C and A are similar.

Triangles A and B are similar.

All the triangles are similar.

Triangles B and C are similar.

None of the triangles are similar.

None of the triangles are similar.

Explanation:

To determine whether triangles are similar recall what "similar" means and the AA criterion. To be "similar" triangles need to have congruent angles. Also recall that all triangles have interior angles that sum to 180 degrees.

Knowing this, look at triangle A.

Two angles are given and the third can be calculated.

Now, look at triangle B.

Now, look at triangle C.

Since triangles A, B, and C do not have any angles that are congruent, none of these triangles are similar.

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